Background/Aims: The significance of hypergammaglobulinemia as a phenotypic feature of inflammatory bowel disease is unknown. Thus, we aimed to analyze the magnitude and significance of hypergammaglobulinemia in newly diagnosed pediatric inflammatory bowel disease patients.

Materials and Methods: The medical records of 296 pediatric onset inflammatory bowel disease patients who were evaluated from 2002 to 2015 were retrospectively reviewed. Patients with recorded immunoglobulin G (IgG) levels were categorized as either normal or high IgG levels at diagnosis. Baseline characteristics included age at onset, sex, severity indices, laboratory data, extraintestinal manifestations, endoscopic findings, and anthropometric measurements.